Brake shoe



Patented July `*1930 UNITED STATES PATENT OFFICE g ALRERI` NELsoN,OECHICAGO, ILLINOIS, .As'sIeNOR 'ro THE AMERICAN BRAKE SHOE @a EOUNDRYCOMPANY, OE WILMINGTON, DELAWARE, A CORPORATION OE 'DELAWARE- BRAKEsIIoE Application Vled December `12, 1928. Serial No. 325,417.

This invention relates yto brake shoes and it ,0 strengthy and betterprotecting thev shoeagainst fracture.

in the accompanying drawings illustrating a selected embodiment of theinvention, Y

Fig. 1 is a top plan view showing one form 5 of the reinforcing" back ina shoe which is broken away and indicated` in broken lines. Fig. 2 is asimilar view showing another form of the reinforcing back. i

Fig?) is aside elevation of the shoe partly 2O shown in section on-theline 3-3 of Fig. 1.

F ig. l is a transversesectional view on the line e-t of Fig. 3.

l have shown the invention embodied in a Asimple form! of solid vcastiron car shoe but it A will be readily'understood thatit may beembodiedin other kinds of shoes, including composite shoes, withoutdeparting from the invention. 'The back 5 is yformed from a i singlepiece of sheet metal by bending and `3o shaping a suitable blank and itis provided with elongated openings 6, Fig. 1, or with a plurality ofcircular openings 7, Fig. 2. The blanlr is provided with beveled sidjeedges 8 and with flat sidemargins 9 which are contom of the crownedportion is in or about the plane vwith the` topofthe side margins, butthe crowning effect may be varied in Vdegree as found desirable. Midwaybetween the in thev body, at the backV thereof, with ther crown exposedbetween the shoulders y10.

nected by curved shoulders 10 withv the flat crowned intermediateportion 11. j The botends of the back, in the embodiment illus-k rlhebody 15 is cast on the back in.

The particular form of back forms a trans verse truss which greatlystrengthens ,the

back and the shoe and,'furthermore, the coni struction provides for aneffective `union of the back with the body which insures against jseparation. The back will also in an etlicient manner hold vthe parts ofthe body together in case of fracture so that the shoe may be continuedin service notwithstanding the` fracture.

Asbefore stated, the invention maybe embodied in other typesof shoe thanthe solid cast iron car shoe illustrated in the drawings and changes inthe form, construction and arrangement of parts may be made in embodyingthe Yinvention in other shoes, and for other purposes within the scopeof the following claims:

I claim:

1.v A,bralre shoe back consisting of a single strip of metal havingoutwardly projecting side marginsfa centrally disposed crowned portionextending the length of the strip,

and shoulders connecting said side marginsl with the crowned portion.

l2. A brake shoe back having Vflat side margins, a lat crowned centralportion eXf' tending substantially the length of the strip, and curvedVshoulders connecting the side margins with the crowned portion. j

3. A brake shoe comprising a back and a bodycast thereon, the backconsisting of a single metal strip having flat side margins, a, atcrowned intermediate portion, andcurved shoulders connecting the marginswith the crowned portion, the body metal embedding the side `margins andthe shoul-` ders and exposing the. top of the crowned v portion.

4. yA brake shoe back having a central portion in one surface and sidemargins inanother `and parallel plane, saidportion and necting saidmargins and central portion,

the portions oining the adjacent edges of the central portion andmargins being angularlyy Y disposed with relation to both of them.

vALBERT NELSON.

ico

CERTIFICATE or CORRECTION.

Patent No. 1,768,921. July 1, 1930.

ALBERT NELSON.

lt is hereby Certified that error appears in the printed specificationof the above numbered patent requiring Correction as follows: Page 1,line 91, claim 4, for "plane" read "surlace"; and that the said LettersPatent should be read with this correction therein that the same mayconform to the record of the case in the Patent Office.

Signed and sealed this 23rd day of May, A. D. 1933.

M. J. Moore.

(Seal) Acting Commissioner of Patents.

